silverstripe-dms/README.md

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# Document Management Module (DMS)
## Overview
The module adds a new `DMSDocument` model which allows management
of large amounts of files, and their relations to pages.
In contrast to the `File` model built into SilverStripe core,
it aims to wrap storage and access concerns in a generic API,
which allows more fine-grained control over how the documents are
managed and exposed through the website.
Features:
* Relation of documents to pages
* Management and upload of documents within a page context in the CMS
* Metadata management through the powerful `GridField` and `UploadField` core APIs
* Configurable tags for documents
* Download via SilverStripe controller (rather than filesystem URLs)
* Access control based on PHP logic, and page relations
* Replacement of existing files
## Documents on the Filesystem
While the DMS architecture allows for remote storage of files,
the default implementation (the `DMS` class) stores them locally.
Relations to pages and tags are persisted as many-many relationships
through the SilverStripe ORM.
File locations in this implementation are structured into
subfolders, in order to avoid exceeding filesystem limits.
The file name is a composite based on its database ID
and the original file name. The exact location shouldn't
be relied on by custom logic, but rather retrieved through
the API (`DMSDocument->getLink()`).
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Example:
dms-assets/
0/
1234~myfile.pdf
1/
2345~myotherfile.pdf
### Requirements
* PHP 5.3 with the "fileinfo" module (or alternatively the "whereis" and "file" Unix commands)
* (optional) [https://github.com/UndefinedOffset/SortableGridField]("SortableGridField" module)
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### Configuration
The file location is set via the `DMS::$dmsFolder` static, and points to a location in the webroot.
### Usage
#### Create Documents
Create by relative path:
$dms = DMS::getDMSInstance();
$doc = $dms->storeDocument('assets/myfile.pdf');
Create from an existing `File` record:
$dms = DMS::getDMSInstance();
$file = File::get()->byID(99);
$doc = $dms->storeDocument($file);
Note: Both operations copy the existing file.
#### Download Documents
$dms = DMS::getDMSInstance();
$docs = $dms->getByTag('priority', 'important')->First();
$link = $doc->getLink();
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#### Manage Page Relations
// Find documents by page
$dms = DMS::getDMSInstance();
$page = SiteTree::get()->filter('URLSegment', 'home')->First();
$docs = $dms->getByPage($page);
// Add documents to page
#### Manage Tags
// Find documents by tag
$dms = DMS::getDMSInstance();
$docs = $dms->getByTag('priority', 'important');
// Add tag to existing document
$doc = Document::get()->byID(99);
$doc->addTag('priority', 'low');
// Supports multiple values for tags
$doc->addTag('category', 'keyboard');
$doc->addTag('category', 'input device');
// Removing tags is abstracted as well
$doc->removeTag('category', 'keyboard');
$doc->removeTag('category', 'input device');
$doc->removeAllTags();